JPH04212375A - Catheter with control valve - Google Patents

Abstract

PURPOSE: To provide a catheter assembly which can prevent the blood from leaking from a catheter before it is connected to a pipe line device for the catheter, and to carry out any of specific modes with the use of auxiliary components. CONSTITUTION: A catheter assembly 10 includes a cannula of a catheter 50 connected to a catheter receptacle 52. A valve membrane 11 which is normally closed, is arranged in the catheter receptacle 52, and is arranged facing an valve membrane opener 120 which is movable. When the catheter 50 and the receptacle 52 are connected to a needle inserting assembly, a needle 24 to be inserted pierce through the membrane opener 120 and the valve membrane 110. When the needle 24 is pulled out, the membrane 110 automatically closes the passage of the catheter receptacle 52. When a pipeline device is connected to the catheter receptacle 52, a connector therefore actuates the valve membrane opener 120 so as to open the valve membrane 110, and accordingly, fluid is fed into a patient through the catheter 50.

Description

[Detailed description of the invention]

BACKGROUND OF THE INVENTION This invention relates generally to intravenous catheters, and more particularly to catheters with valves that open when the catheter is connected to a delivery tubing device. During use of the intravenous catheter assembly, the catheter's cannula and its insertion needle are inserted into the patient's body. Once the cannula is properly placed within the blood vessel, as evidenced by the appearance of a small amount of blood in the flush chamber of the needle assembly, the needle is withdrawn from the patient and removed from the catheter. A delivery tube device is then connected to the catheter to deliver fluid to the patient. Throughout this procedure, it is preferable to minimize and completely eliminate blood leakage from the assembly to reduce the risk of transmitting blood-borne diseases to medical personnel. In particular, it would be desirable for the valve mechanism to automatically seal the cannula of the catheter when the needle is withdrawn from the catheter to prevent blood from leaking out of the catheter. The cannula should preferably remain sealed until the delivery tube device is connected to the catheter to deliver fluid to the patient. Once the delivery tube device is connected to the catheter, the assembly is in a fluid tight condition and subsequent blood leaks are less likely to occur.

US Pat. No. 3,585,996 shows an arterial catheter installation device that includes a needle assembly having a needle connected to a needle port. A self-sealing disc valve formed from a relatively thick piece of rubber with several fine slits is placed within the needle socket. This needle port is designed to connect to a catheter and a sheath with a sheath port. A hollow guide tube extends from the distal tip of the sheathed port and the catheter is advanced through the guide tube during insertion and screwing. When the needle receptacle is not connected to the coated receptacle, the disk valve is in its normal closed state which will prevent blood from leaking from the receptacle. When the sheathed socket is connected to the needle socket, a guide tube placed over the snout of the sheathed socket extends through the valve disc and holds the valve open so that the catheter can pass through the valve. It means allowing yourself to be screwed. After the coated socket is removed from the needle socket, the valve will automatically close, preventing blood flow from the artery through the needle.

Catheters are capable of automatically opening when an insertion needle is passed through the catheter, automatically closing when the needle is withdrawn from the catheter, and automatically opening when a delivery tubing device is connected to the catheter. As such, it would be desirable to apply the valve principles of the '996 patent to a catheter assembly. Accordingly, the assembly may achieve these particular modes of operation with various ancillary components listed to prevent blood leakage from the catheter prior to connection of the catheter to the delivery tubing device. It must be possible to do so.

In accordance with the principles of the present invention, a catheter assembly is provided that includes a catheter cannula connected to a catheter port. The normally closed valve leaflets
Placed within the catheter port. The leaflet is placed opposite a leaflet opener which is movable. When the catheter and socket are connected to the insertion needle assembly, the insertion needle pierces the membrane opener and the valve leaflets. When the needle is withdrawn from the membrane opener and membrane, the membrane automatically seals the catheter port passageway. When the delivery tubing device is connected to the catheter port, the connector of the delivery tubing device actuates the leaflet opener to open the valve leaflets so that fluid can be pumped through the catheter and into the patient.

Referring first to FIG. 1, a perspective view of a catheter assembly constructed in accordance with the principles of the present invention is shown. 1, a catheter assembly 10 constructed in accordance with the principles of the present invention is shown. Assembly 10 includes a needle housing 20 that is bi-tube shaped and open-topped. Both sides of the needle housing 20, only one of which is visible in FIG. Opposedly contoured finger grips 22 are formed. A tubular needle guide 30 is disposed within and extends proximately from a bifurcated needle housing. Disposed on the upper surface of the needle guide are a number of small protrusions 32 provided on the surface so that the user can push them in to fully extend the needle guide. These projections allow the user to hold the catheter assembly in one hand while extending the needle guide with the index finger or other fingers. A protective covering, not shown here, extends distally from the needle housing 20 to cover the distally extending needle and catheter.

FIG. 2 shows FIG. 1 after the protective coating has been removed.
The assembly is shown. This figure shows a catheter 50 and a catheter port 52 attached to the distal end of the needle guide 30. The tip of needle 24 is shown extending from the distal tip of catheter 50. Removal tab 34 is shown projecting upwardly from the needle guide near the base of catheter port 52. A needle guide tip 60 through which needle 24 extends is located at the distal end of the needle guide.

FIG. 2 also shows a cross-section of catheter assembly 10. Catheter 50 is shown extending from and concentrically with distal end 54 of catheter port 52. The catheter may be attached to the receptacle by means known in the art, including adhesive attachment and mechanical attachment with eyelets. The enlarged proximal portion 56 of the catheter port 52 is flanged at its proximal end for connection to an infusion device, and the inner diameter of that proximal portion of the port is similar to the distal portion of the needle guide tip 60. The size is such that it can be fitted over the

[0008] Needle 24 is attached to the distal end of a flush chamber 26 of the needle housing, with the proximal end of needle 24 terminating within that chamber. Needle 24 is secured in place by adhesive 28. A needle extends through the needle guide tip 60, needle port 52, and catheter 50, with the needle point extending from the distal end of the catheter. The rear of the flash chamber 26 is plugged by a microporous plug 70. The needle guide is shown extending proximate the rear of the needle housing with the needle guide tip 60 secured to the distal end of the needle guide at the location of the removal tab 34. The tubular needle guide surrounds a flash chamber 26, the base 27 of which is disposed within a longitudinal slot 36 in the bottom of the needle guide. As the needle guide slides distally to cover the needle, it
maintained concentrically with the needle housing.

A flange 72 is formed at the distal end of the housing. Flash chamber 26 is shown centrally located within the housing. Needle guide 30 and housing 20 slide relative to each other until narrow proximal end 92 of needle guide slot 36 engages opening 74 in the housing such that these two components It will be locked. An instrument is inserted into the opening 74 and into the slot 36 to widen the narrowed portion 92 of the slot, thereby allowing the needle guide to advance fully into the needle housing. The concentric tubular structure of the needle guide and housing also allows the needle guide to slide into the housing from the proximal end of the housing. Therefore, if the catheter device is connected to the needle guide 30
The need to disengage the narrow portion 92 of the guide slot during assembly of the device is also eliminated, since it can be assembled without having to pass through its locking position.

The catheter assembly of FIG. 2 may be used in a conventional manner by inserting a concentric catheter and needle through the patient's skin and into a blood vessel. When the tip of needle 24 is properly placed within the blood vessel, a small amount of blood will flow through the needle and into flush chamber 26. The needle housing and guide are formed from a transparent or translucent polymeric material so that blood flow within the flash chamber is easily visible. Thereafter, the finger grip 22 of the housing with the thumb and fingers
The needle is withdrawn from the blood vessel by squeezing the removal tab 34 distally with one finger and removing the catheter 50.
is inserted into the blood vessel. This movement forces catheter port 52 out of needle guide tip 60 and advances the catheter. When the needle guide begins to extend out of the distal end of the needle housing such that the removal tab 34 is beyond the reach of the user's fingers, the user fingers the projection 32 to continue the distal movement of the needle guide. can be engaged with.

Ultimately, this movement will result in proper threading of the catheter into the blood vessel and complete withdrawal of the needle from the patient's body. The needle guide 30 is then advanced to its maximum extension. When so done, the tapered proximal section of the flash chamber 26 will widen the narrow proximal portion 92 of the needle guide slot 36 until the narrowed portion 92 engages the opening 74 . At the stage of maximum extension of the needle guide from the housing, engagement of the narrowed portion 92 within the opening 74 will lock the needle guide 30. Then, the needle 24 and the housing 20
and guide 30 can be spaced apart without fear of inadvertent injury to the user or others.

As best seen in FIGS. 3, 4a, 4b and 4c, a catheter 50 and catheter port 52 assembly is shown incorporating the membrane assembly 100 of the present invention. This membrane assembly 100 includes a catheter port 5
2 and comprises a one-way valve leaflet 110. This leaflet is initially sealed, even before the needle 24 is inserted into the catheter 50. The leaflet 110 essentially comprises any known plastic, rubber or other malleable gasket material or one-way valve material. Upon insertion of the flexible socket introducer needle 24 into the catheter 50 assembly, the membrane 110 is punctured, as best seen in Figure 4a. Therefore, the remainder of the introduction of needle 24 into the patient will remain in accordance with the currently selected procedure.

As best seen in FIG. 4b, the needle 24 is withdrawn from the catheter 50 and catheter port 52 assembly. Withdrawal from catheter port 52 causes valve leaflets 110 to close. In removing the needle 24,
It should be noted that two important improvements in the functionality of catheter assembly 10 are realized. First, unlike other systems, the present catheter assembly 10 prevents blood from leaking into the flush chamber 26 through the catheter 50. Normally, blood flowing from the human body has a pressure of about 2 psi. Valve leaflet 110
is configured to resist outward blood flow of greater than about 3 psi, i.e., blood flow into flush chamber 26 through catheter 50 that is well beyond normal human limits. . Furthermore, even if the leaflets 110 are inserted into the catheter assembly 10, the leaflets 110 remain in contact with the needle 2 while being withdrawn from the catheter 50.
4 so that there is no frictional resistance. this is,
This is because the valve leaflets 110 are generally formed as a "platypus" valve or other similar valve configuration, allowing for smooth withdrawal of the needle 24 from the catheter. When needle 24 is withdrawn from catheter 50, the leaflets close in one direction to prevent blood from flowing into flush chamber 26.

As further shown in FIGS. 3 and 4c, receptacle 52 also includes a membrane opener 120. The membrane opener 120 is generally cylindrical in shape and includes a snout-shaped opening means 122 . These snout-shaped opening means 122 fit snugly within the leaflets 110 when inserted. Furthermore, the collar mechanism 160 is connected to the catheter socket 5.
Attached to 2. This collar mechanism 160 holds the membrane opener 120 in place when the Luer assembly 150 is attached to the catheter port 52. When Luer assembly 150 is attached to catheter port 52 at flange 58, intravenous fluid is connected to catheter 50 so that it can be diffused into the human body.

Luer assembly 150 is connected to catheter port 5.
2, the collar mechanism 160 holds the membrane opener 120 in place such that the snout-shaped opening means 122 of the membrane opener 120 advances to open the leaflets 110. This is best shown in Figure 4c. Thus, when the valve leaflets 110 are open, nutritional fluid can be dispensed into the human body.

Importantly, even if the Luer assembly 150
biasing the membrane opener 120 open, the increase in force required to attach the Luer assembly 150 to the catheter port 52 or to open the valve leaflets 110 is not appreciable. That's what it means. Therefore, actual use of the catheter control valve assembly of the present invention requires no auxiliary treatment or work by the user. In addition, the opening means 122
The valve leaflet 110 is wide enough to maintain the flow rate within 0.
formed to open. Therefore, a uniform flow rate within the catheter 50 is achieved. In this way, work is not exposed to danger during the actual use of the invention.

Accordingly, a valved catheter port assembly as described above is disclosed. It is to be understood that the invention as represented by this control valve assembly is to be understood in the following claims and their equivalents.

Specific embodiments of this invention are as follows. 1. The assembly of claim 1, wherein the receptacle has a circular cross section such that the membrane is disposed across the cross section and is slidably engaged within the receptacle. The opener is also engageable with the membrane, and the membrane is disposed between the opener and the catheter. (2) In the assembly according to embodiment 1 above, the valve allows fluid flow from the opener side to the catheter side and rejects fluid flow from the catheter side to the opener side. What has been achieved. (3) In the assembly according to the second embodiment, the membrane is configured to be able to receive a needle installed in the catheter from the opener side. (4) further comprising a needle connected to the receptacle and insertable into the catheter through the membrane, the membrane being sealed against fluid flow from the catheter side to the opener side; The assembly according to embodiment 2 above, wherein the assembly continues to be used. (5) The assembly of embodiment 4 above, wherein the membrane is configured to resist flow up to about 3 psi. (6) The assembly according to embodiment 4, wherein the membrane comprises a platypus valve. (7) The assembly according to embodiment 4, wherein the needle can be withdrawn from the membrane while maintaining a seal from fluid flow from the catheter side to the opener side. (8) The assembly of embodiment 4 above, wherein the opener has a snout-shaped end insertable into the membrane to open the membrane and allow fluid flow across the valve. Something that was made to do. 9. The assembly of claim 2, wherein said receptacle further comprises a membrane opener. (10) The assembly according to embodiment 9, wherein the receptacle has a circular cross section such that the membrane is disposed across the cross section and is slidably engaged within the receptacle. The opener is also engageable with the membrane, and the membrane is disposed between the opener and the catheter. (11) In the assembly according to the tenth embodiment, the valve is configured to be sealed against fluid flow from the catheter side to the flush chamber side. (12) The assembly of embodiment 11 above, wherein the membrane is configured to block flow up to about 3 psi. (13) The assembly according to embodiment 11, wherein the membrane includes a platypus valve. (14) The assembly according to embodiment 11, wherein the needle can be withdrawn from the membrane while maintaining a seal from fluid flow from the catheter side to the opener side. (15) The assembly according to embodiment 11, wherein the opener has a snout-shaped end insertable into the membrane to open the membrane and allow fluid flow across the valve. Something that was made to do. (16) the opener is slidably engaged within the receptacle, the receptacle being attachable to the luer assembly such that the luer assembly is attached to the receptacle; 4. The assembly of claim 3, wherein the valve is slidable to open the valve.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a catheter assembly constructed in accordance with the principles of the present invention.

FIG. 2 is a cross-sectional view of the catheter assembly of FIG. 1;

3 is a detailed cross-sectional view of the catheter and catheter port of the assembly of FIGS. 1 and 2; FIG.

4a to 4c each depict a catheter and catheter port of the invention in various stages of use; FIG.

Claims (3)

[Claims] 1. A catheter assembly for attaching a catheter to a catheter receptacle, comprising a valve having a membrane disposed within the receptacle to seal the receptacle from the catheter; An improvement in that the mouth further comprises a membrane opener. 2. A tubular needle housing, a hollow needle extending from a distal end of the tubular needle housing, and a flash chamber disposed within the housing, wherein the hollow needle is connected to the flash chamber. a flush chamber extending from the hollow needle, the passageway of the hollow needle being in fluid communication with an interior of the flush chamber; a catheter receptacle attachable over the needle housing; a catheter attached to a receptacle into which the needle is insertable;
The catheter assembly further comprises a valve for positioning a membrane between the chamber and the catheter. 3. A needle housing in the form of a bisected tube with an open top; a flush chamber having a hollow needle disposed within the needle housing and extending from a distal end thereof; a tubular needle guide slidably disposed within the needle housing and including an opening at its distal end for passage of the hollow needle and housing the flash chamber; and a distal end of the needle guide. A catheter assembly comprising a catheter and a catheter receptacle assembly suitable for attachment to the receptacle, and a valve and valve opener assembly retained within the receptacle.